WFRF:(Hudl Matthias)
Search: WFRF:(Hudl Matthias) > (2010-2014) > Magnetic materials ...
- 4 of 14
- Previous record
- Next record
- To hitlist
Magnetic materials with tunable thermal, electrical, and dynamic properties : An experimental study of magnetocaloric, multiferroic, and spin-glass materials
-
- Hudl, Matthias, 1981- (author)
- Uppsala universitet,Fasta tillståndets fysik,Division of Solid State Physics
-
- Nordblad, Per, Prof. (thesis advisor)
- Uppsala universitet,Teknisk-naturvetenskapliga fakulteten
-
- Sarma, DD, Prof. (opponent)
- Indian Institute of Science
- (creator_code:org_t)
- ISBN 9789155482879
- Uppsala : Acta Universitatis Upsaliensis, 2012
- English 187 s.
- Series: Uppsala Dissertations from the Faculty of Science and Technology, 1104-2516 ; 98
- Doctoral thesis (other academic/artistic)
Abstract
Subject headings
Close
- This thesis concerns and combines the results of experimental studies of magnetocaloric, multiferroic and spin-glass materials, using SQUID magnetometry as the main characteriza-tion technique. The magnetocaloric effect offers an interesting new technology for cooling and heating applications. The studies of magnetocaloric materials in this thesis are focused on experimen-tal characterization of fundamental magnetic properties of Fe2P-based materials. These are promising magnetocaloric materials with potential industrial use. It is found that the magneto-caloric properties of Fe2P can be optimally tuned by substitution of manganese for iron and silicon for phosphorus. Furthermore, a simple device to measure the magnetocaloric effect in terms of the adiabatic temperature change was constructed. Materials that simultaneously exhibit different types of ferroic order, for example magnetic and electrical order, are rare in nature. Among these multiferroic materials, those in which the ferroelectricity is magnetically-induced, or vice versa the magnetism is electrically-induced, are intensively studied due to a need for new functionalities in future data storage and logic devices. This thesis presents results on two materials: Co3TeO6 and Ba3NbFe3Si2O14, which belong to the group of magnetically-induced ferroelectrics and exhibit strong coupling be-tween the magnetic and the electrical order parameter. Their ordering properties were studied using magnetic and electrical measurement techniques. The coupling between the magnetic and electronic degrees of freedom was investigated using high-field and low-temperature Raman spectroscopy. Spin-glass materials exhibit complex magnetism and disorder. The influence of the spin dimensionality on the low and high magnetic field properties of spin glasses was investigated by studying model Heisenberg, XY and Ising spin-glass systems. Significant differences were found between the non-equilibrium dynamics and the hysteresis behavior of Heisenberg systems compared to those of XY and Ising spin glasses.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Magnetocalorics
- multiferroics
- spin glasses
- magnetization
- polarization
- spin-dimensionality
- Fasta tillståndets fysik
- Solid State Physics
Publication and Content Type
- vet (subject category)
- dok (subject category)
Find in a library
- Magnetic materials with tunable thermal, electrical, and dynamic properties An e... (Search the publication in LIBRIS)
To the university's database
- 4 of 14
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Hudl, Matthias, ...
- Nordblad, Per, P ...
- Sarma, DD, Prof.
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- and Condensed Matter ...
- Parts in the series
- Uppsala Disserta ...
- By the university
- Uppsala University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
